I'm thinking about that analogy that Akka used to tell Esmi what had happened to X's soul when the Scarlet Spires compelled him. Something about a flood that washes over the land and changes the course of the rivers. I wonder if Kellhus could manipulate a soul to the point that it gained the Gift of the Few? No hints of this so far, but it would be neat.
Or manipulate a soul to the point it lost its gift--this would be a cool way to take down Consult members. Like the end of Avatar: The Last Airbender?